Many of the R7U and 1LE specific options first introduced in 87 (R7U cars) and 1988 with the introduction of the 1LE package became running changes in the line as they went forward - even the JG1 Aluminum Driveshaft was around ahead of that time, developed to help in weight reduction & CAFE regulations.
The one assembly that did not become mainstream were the front spindle, bearing, caliper and rotor assemblies derived from the corvette & C10 truck programs. Those remained 1LE (& TTA) specific.
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Some guys they just give up living
And start dying little by little, piece by piece,
Some guys come home from work and wash up,
And go racin' in the street.
Bruce Springsteen - Racing In The Street - 1978
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